Segmental Dynamics and Density Fluctuations in Polymer Networks during Chemical Vitrification

1999 ◽  
Vol 32 (12) ◽  
pp. 4134-4140 ◽  
Author(s):  
Benjamin D. Fitz ◽  
Jovan Mijovic
Keyword(s):  
Polymer Networks ◽  
Density Fluctuations ◽  
Segmental Dynamics

Main chain and segmental dynamics of semi interpenetrating polymer networks based on polyisoprene and poly(methyl methacrylate)

Polymer ◽  
2010 ◽  
Vol 51 (11) ◽  
pp. 2390-2402 ◽  
Author(s):  
Jacob John ◽  
Damir Klepac ◽  
Mirna Didović ◽  
C.J. Sandesh ◽  
Yong Liu ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Main Chain ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Segmental Dynamics ◽  
Poly Methyl Methacrylate

scholarly journals Influence of cross-linking on the segmental dynamics in model polymer networks

2000 ◽  
Vol 113 (1) ◽  
pp. 447-452 ◽  
Author(s):  
V. Yu Kramarenko ◽  
T. A. Ezquerra ◽  
I. Šics ◽  
F. J. Baltá-Calleja ◽  
V. P. Privalko
Keyword(s):  
Polymer Networks ◽  
Cross Linking ◽  
Segmental Dynamics

Crosslinker Chemistry Determines the Uptake Potential of Perfluorinated Alkyl Substances by β-Cyclodextrin Polymers

2018 ◽  
Author(s):  
Leilei Xiao ◽  
Casey Ching ◽  
Yuhan Ling ◽  
Mohammadreza Nasiri ◽  
Max Justin Klemes ◽  
...  
Keyword(s):  
Binding Affinity ◽  
Polymer Networks ◽  
Cyclodextrin Polymer ◽  
Perfluorinated Alkyl Substances ◽  
Cyclodextrin Polymers

This work describes several crosslinked β-cyclodextrin polymer networks and correlates the crosslinker chemistry with binding affinity for per- and polyfluorinated alkyl substances (PFASs), including PFOA and PFOS.

Design and Synthesis of Two-Dimensional Covalent Organic Frameworks with Four-Arm Cores: Prediction of Remarkable Ambipolar Charge-Transport Properties

2019 ◽  
Author(s):  
Simil Thomas ◽  
Hong Li ◽  
Raghunath R. Dasari ◽  
Austin Evans ◽  
William Dichtel ◽  
...  
Keyword(s):  
Charge Transport ◽  
Organic Semiconductors ◽  
Density Functional ◽  
Polymer Networks ◽  
Two Dimensional ◽  
Covalent Organic Frameworks ◽  
X Ray Diffraction ◽  
Zinc Porphyrin ◽  
Design And Synthesis ◽  
Predicted Values

<p>We have considered three two-dimensional (2D) π-conjugated polymer networks (i.e., covalent organic frameworks, COFs) materials based on pyrene, porphyrin, and zinc-porphyrin cores connected <i>via</i> diacetylenic linkers. Their electronic structures, investigated at the density functional theory global-hybrid level, are indicative of valence and conduction bands that have large widths, ranging between 1 and 2 eV. Using a molecular approach to derive the electronic couplings between adjacent core units and the electron-vibration couplings, the three π-conjugated 2D COFs are predicted to have ambipolar charge-transport characteristics with electron and hole mobilities in the range of 65-95 cm<sup>2</sup>V<sup>-1</sup>s<sup>-1</sup>. Such predicted values rank these 2D COFs among the highest-mobility organic semiconductors. In addition, we have synthesized the zinc-porphyrin based 2D COF and carried out structural characterization via powder X-ray diffraction and surface area analysis, which demonstrates the feasability of these electroactive networks.</p>

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